package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    @Autowired
    private DishMapper dishMapper;

    /**
     * 添加购物车
     *
     * @param shoppingCartDTO
     */
    @Override
    public void add(ShoppingCartDTO shoppingCartDTO) {

        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);

        //判断当前加入的购物车商品是否在购物车中
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        // 如果存在，则数量+1
        if (list != null && list.size() > 0) {
            list.get(0).setNumber(list.get(0).getNumber() + 1);// update shopping_cart set number = number + 1 where id = ?
            shoppingCartMapper.updateNumberById(list.get(0));
        }

        // 如果不存在，则添加到购物车，数量默认为1
        else {
            //判断添加的是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();

            if (dishId != null) {
                // 添加的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setName(dish.getName());
                shoppingCart.setAmount(dish.getPrice());

            } else {
                // 添加的是套餐
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 查看当前用户的购物车数据
     *
     * @return
     */
    @Override
    public List<ShoppingCart> list() {
        //获取当前用户的id
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(userId)
                .build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /**
     * 清空购物车
     */
    @Override
    public void cleanShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.cleanShoppingCart(userId);
    }

    /**
     * 减少购物车中的商品数量
     * @param shoppingCartDTO
     */
    @Override
    public void sub(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        //设置查询条件，查询当前用户的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if (list != null && list.size() > 0) {
            //如果购物车中有数据，则判断当前商品是否在购物车中
            shoppingCart = list.get(0);
            Integer number = shoppingCart.getNumber();
            //如果当前商品在购物车中，则数量-1
            if (number > 1) {
                shoppingCart.setNumber(number - 1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }
            //如果当前商品在购物车中，且数量为1，则从购物车中删除该商品
            else {
                shoppingCartMapper.deleteById(shoppingCart.getId());
            }
        }
    }


}
